Disk talking-machine.



WITN ESSES;

R. PRESZTER.

DISK TALKING MACHINE.

APPLICATION FILED SEPT. 29, 1908.

Patented 001;. 21, 1913.

\NVENTOR, R E 25's PRESZTER,

outrun STATES rarnnr orrion.

nnzso raaszran, nonsense, .ausrma nuneaiw.

msK TALKING-MACHXNE.'

amt i3.

Original application filediuly 9, 1907, eria1 No. 382,8 I v e e1 was. s

i '0 all whom it may concern Be it known that l, Rnzso Pnnsz'rnn, a subject of the King of Hungary, residing at Budapest, in the Empire of Austriadllingary, have invented a new and useful Disk 'ialkingiachine; and I do hereby declare snap dle and to transport.

following to be a full, clear, and exact tion of the same.

present application is a division of I 'plication, Serial No. 382,969, filed by me July 9, 1907.

The object of this invention is to obviate the necessity of employing a trumpet with disk talking machines.

It is well known that sound trumpets generally used affect the purity of the sound and make the machine more difficult to han- It was already pro.-

' osed to cover the trum etof talkin machines or to conduct it through the casing of the machine. Thereby the trumpet was only disguised, but substantially maintained so that the sound effect was not improved by this Way. As on the other hand the dimensions of the casing should not be increased too far, the dimensions of the trumpet were reduced, whereby the sound strength "was decreased. But as the dimensions of the trumpet could not be" decreased too far, the

dimensions of the casing resulted larger,

than the usual casings of talking machines. My invention does away completely with the usual trumpets without increasing the usual dimensions of the casing. According to the disclosed embodiments of my invention the free space ofthe casing containing the gear is subdivided by means of resonance boards in a way to form laterally from the gear a sound chamber of substantially the shape of pyramid and to form adjacent resonance boxes.

The annexed drawing shows as examples two embodiments of my invention.

Figure l is a diagrammatical vertical section of the machine according to line CD of Fig. 2. Fig. 2 is a horizontal section according to line EF of Fig. 1 and Fig. 3 is a similar section of a'modified form.

The sound is guided from the sound box 9 behind the diaphragm downward 2 into the free space in the casing 3 through a pivoted bent tube 1 which extends from the back of the sound box. In the free space of the casing are arranged. two oblique walls a and 5, t'orx'ning together with the wallsof Specification of Letters Iatent.

the casing a pyramidal funnel. The remainwhich increases and mellows the sound effeet. The thickness '01? the walls 4t and 5 is calculated in a way, that these walls may form co vibrating membranes increasing the vibrations produced by the membrane of the sound box 9. The wallsl and 5 are made of thin wooden boards. Owing to the wall 4; being arranged laterally or" the clock work. 11 and the sound tube 2 being arranged not in the center of the casing but at the side, the dimensions of the casing can be made very small and the usual dimensions of the casing for arranging the sound boards and the soundchamber need not by any means be increased.

In order to facilitate the vibration of the resonance boards it is advisable to adopt tor the wall the divided form shown in Fig. 2, which then constitutes two separate vibrat- Patented 0013121, 1913. I as. Divided and. this application fi cdseptcmberw, No. i5s,.50. j

ing diaphragms i and 10. The arrangement of the walls i and. 10 can be made also in the manner shown in Fig. 3,. in which the sound waves strike the resonance boards a and 10 are reflected through the opening 6 outward. The opening 6 for the escape of the sound is in the above construction situated in oneof the lateral walls of the easing,but could be arranged in the bottom it desired. This. opening may be providedwith a slide or the like 7 for the purpose of damping the sound by means of an adjustable closing device.

Having described my invention, what I claim is 1. A. sound reproducing device comprising a motor, a record carrying table operated tl1ereby,a sound box and tone arm therefor combined with a casing for and to support said parts and partitioned to form separate compartments, one of which incloses said motor, the other having an inclined wall to cooperate with the walls and partitioning of said casing to form a sound ai'uplifier of gradually increasing cross sectional area with a sound inlet at its smaller end in communication with said tone arm, and a sound exit opening at its larger end, said motor and amplifier compartments being arranged side by side to obtain a low height of easing, substantially as and for the purpose set forth.

2. In a sound producing device, the comsmall opening to the lower side of said large opening, said partitionand sounding board being joined together and to the top and a side wall respectively whereby is formed a pyramidal sound funnel with which both of said openings communicate.

3.111 a sound producing device, the combination of a hexahedral casing having a large opening in its front wall and a small opening near the upper rear corner; a vertical partition extending the casing from near the near one side of the. large clined soundboard extending across the casing from near the small opening to the bottom of the large opening; said partition, sounding board and the adjacent top and side Walls of the casing being joined to form a pyramidal sound funnel having its small end in communication with the small opensmall opening to obliquely acrossopening; an innot/aces swinging sound-arm, a rotatable record support having. an upright shaft, a casing, driving mechanism within said casing forlthe rotatable support, a partition substantially parallel to the rotating shaft of the record support dividing the casing in a plane substantially parallel to the plane of the record support into two chambers, one of said chambers containing the driving mechanism and the other-chamber forming a sound amplifier, said partition being arranged to provide with the casing said amplifier of gradually increasing cross sectional area, com- 'municating at its smaller end with the swinging sound arm and through openings of the caslng with the outer air.

In testirnony whereof, I have signed my name to this specification in the presence of two subscribing Witnesses. REZSO 'PRESZTER. Witnesses:

EUGENO ,HARRANY, TERENEZ BENEDIK. 

